const path=require('path');
const HTMLPlugin=require('html-webpack-plugin');
const webpack=require('webpack');
const ExtractPlugin=require('extract-text-webpack-plugin');
const isDev=process.env.NODE_ENV === 'development'; // 判断是否为开发环境

const config={
    target: "web",
    entry: path.resolve(__dirname,'src/index.js'),
    output: {
        filename: "bundle.[hash:8].js",
        path: path.resolve(__dirname,"dist")
    },
    module: {
        rules: [
            {
                test:/\.vue$/,
                loader: "vue-loader"
            },
            {
                test:/\.jsx$/,
                loader: "babel-loader"
            },
            {
                test:/\.(jpg|png|jpeg|svg|gif)$/,
                use: [
                    {
                        loader: "url-loader",
                        options: {
                            limit:1024,
                            name:'[name].[ext]'
                        }
                    }
                ]
            }
        ]
    },
    plugins: [
        new webpack.DefinePlugin({
            'process.env':{
                NODE_ENV:isDev ? '"development"':'"production"'
            }
        }),
        new HTMLPlugin()
    ]
};

if (isDev) {
    config.module.rules.push(
        {
            test:/\.styl/,
            use: [
                'style-loader',
                'css-loader',
                {
                    loader: "postcss-loader",
                    options: {
                        sourceMap:true
                    }
                },
                'stylus-loader'
            ]
        });
    config.devtool = '#cheap-module-eval-source-map';
    config.devServer = {
        port: 3333,
        host: '127.0.0.1',
        overlay: {
            errors: true
        },
        hot: true,
        open:true
    };
    config.plugins.push(
        new webpack.HotModuleReplacementPlugin(),
        new webpack.NoEmitOnErrorsPlugin()
    )
}else{
    config.entry={
        app:path.resolve(__dirname,'src/index.js'),
        vendor:['vue']
    }
    config.output.filename='[name].[chunkhash:8].js'
    config.module.rules.push(
        {
            test:/\.styl/,
            use: ExtractPlugin.extract({
                fallback:'style-loader',
                use:[
                    'css-loader',
                    {
                        loader: "postcss-loader",
                        options: {
                            sourceMap:true
                        }
                    },
                    'stylus-loader'
                ]
            })
        }
        )
    config.plugins.push(
        new ExtractPlugin('styles.[contentHash:8].css'),
        new webpack.optimize.CommonsChunkPlugin({
            name:'vendor'
        }),
        new webpack.optimize.CommonsChunkPlugin({
            name:'runtime'
        })
    )
}

module.exports=config;